This book is filled with grammatical errors, no introduction about the writer or writers and their education background and worse a substantial amount of info about Avecina are completely false when compared to many other books I read and I am still reading about him. He is described in this unreliable text that he was an alcoholic. I never heard of any alcoholic who achieved a fraction of what he achieved in medicine, philosophy, maths ....etc

I don't recommend readers to waste their time with this text(not even a book in my view).